Tunable plasmonic metasurface for perfect absorption
Tunable plasmonic metasurface for perfect absorption
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DOI：
10.1051/epjam/2017001
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发表时间：
2017-02-17
影响因子：
1.6
通讯作者：
Pendry, John B.
中科院分区：
文献类型：
--
作者：
Huidobro, Paloma Arroyo;Maier, Stefan A.;Pendry, John B.
可调的元表面，其功能可以动态修改，开辟了超紧凑的光子元件与可重构应用的可能性。在这里，我们考虑受空间周期性栅极偏置影响的石墨烯单层，由于石墨烯中的表面等离子体，它作为太赫兹辐射的可调谐和极其紧凑的超表面。在表征了它的功能后，我们表明它可以作为超薄完全吸收器的基本构建块。在这种亚波长厚度的器件中，传输和反射通道被阻断，电磁能量完全被超表面构件吸收。所提出的结构可以用作调制器，其工作频率可以通过缩放其大小或调整掺杂水平来改变。
Tunable metasurfaces, whose functionality can be dynamically modified, open up the possibility of ultra-compact photonic components with reconfigurable applications. Here we consider a graphene monolayer subject to a spatially periodic gate bias, which, thank to surface plasmons in the graphene, acts as a tunable and extremely compact metasurface for terahertz radiation. After characterizing its functionality, we show that it serves as the basic building block of an ultrathin complete absorber. In this subwavelength-thickness device, transmission and reflection channels are blocked and electromagnetic energy is completely absorbed by the metasurface building blocks. The proposed structure can be used as a modulator, and its frequency of operation can be changed by scaling its size or adjusting the doping level.